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Finding the Fourth Proportional to 398,542.80, 548,869.32 and 389,833.68

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Solution

The fourth proportional to 398,542.80, 548,869.32 and 389,833.68 is: 536,875.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,542.80 : 548,869.32 = 389,833.68 : x
  2. Step 2: Convert to fraction form
    398,542.80/548,869.32 = 389,833.68/x
  3. Step 3: Cross multiply
    398,542.80x = 548,869.32 × 389,833.68
  4. Step 4: Simplify right side
    398,542.80x = 213,967,746,854.70
  5. Step 5: Solve for x
    x = 213,967,746,854.70/398,542.80
  6. Step 6: Final answer
    x = 536,875.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.